No exact cause for either prostate or lung cancer is known, according to MayoClinic.com. A number of factors do play a role, some of which people can control, some of which they cannot. These cancers differ in who they affect; prostate cancer affects only men, while lung cancer can affect anyone. While it may not be possible to prevent either one, knowing the risk factors may help.
Family History
Family history is a common risk factor for both prostate and lung cancer. The American Cancer Society states men with close family members such as a father or brother who currently have prostate cancer, or who have had it in the past, face a greater risk of developing the disease as well.
The same is true for brothers, sisters and children of those who currently suffer from, or who have suffered from, lung cancer. The Society adds it is not clear how much of a role genetics actually play in the development of the disease versus exposure to environmental factors such as tobacco smoke.
Smoking
Both the American Cancer Society and MayoClinic.com point out smoking is the single greatest risk factor for the development of lung cancer. MayoClinic.com warns this risk increases with the number of cigarettes a person smokes per day and the length of time they have been smoking.
A Man's Age
The risk of developing prostate cancer increases as a man becomes older. The American Cancer Society states it is the biggest risk factor men face, increasing rapidly after the age of 50. The Society adds nearly two out of three cases of prostate cancers are in men over the age of 65.
Radon Exposure
Exposure to radon is a risk factor for the development of lung cancer, according to the American Cancer Society. Radon itself is a natural gas in the soil as a result from the breakdown of uranium in the soil and rocks. Homes built on this soil may have high levels of radon, especially if the houses have basements. Those living in a house contaminated with radon for many years may face a greater risk of developing lung cancer.
Ethnicity
MayoClinic.com and the American Cancer Society both explain the risk of developing prostate cancer is higher among African-American men than in men of other races. In addition, the disease is more likely to be in its advanced stages when found, and these men are more likely to die from it.
Radiation Therapy
People who receive radiation therapy to the chest face a higher risk for developing lung cancer. This is especially true if they also smoke, according to the American Cancer Society. Patients who generally fall under this risk category include women who receive radiation after a mastectomy, and those who receive treatment for Hodgkin's disease.
